SpeedFan will report the RPMs of any fans connected to the motherboard fan headers. If they're just wired to the CPU, they won't show up. That said, if it's really 90°C, the CPU fan should be going much faster, somewhere in the 3000 - 4000 RPM range.

I got an E6750, OC'd to 3,00Ghz and temps are 35-65C (it was OC'd to 3,2 before, and temps was same), and I'm using the stock Intel cooler. So 90C is HOT.
Btw, my Intel stock cooler runs on 1300-2200RPM (~1350 rpm on idle).

SpeedFan will report the RPMs of any fans connected to the motherboard fan headers. If they're just wired to the CPU, they won't show up. That said, if it's really 90°C, the CPU fan should be going much faster, somewhere in the 3000 - 4000 RPM range.

First off, never mind what people are saying and do one thing FIRST !
double check wether your reading the temp as FARENHEIT or CELCIUS !
If its is Farenheit then don't worry about it and carry on about your business / everything is fine !
If it is Celcius your reading ? ..then start worrying !
Your CPU will shut itself off at about 100 degrees Celcius so it is not possible to damage the cpu that way
but if you were to run it close to the limit all the time it would suffer damage i'm sure (shorter life span)

grab something like CoreTemp or RealTemp and see what it sets for your TJ max
ansd see what your getting reported for TCase and your 2 T Junction sensors.

My similar C2D runs some what idle at about 38 c (Tcase) and 38/36 for the two Tjunction's
and that is about 105/100/97 in farenheit.
So to put that into persepctive for you.. i have done TONS of case mods and used many fans etc
And my temps under NO circumstances will read lower that ! approx 36/38 is teh lowest possible temp.

And one last piece of trivia for you too
The internal Core temps (TJ1 and TJ2) are designed on purpose to have a sliding slope on teh accuracy..
the higher the temp the more accurate the temp is. So what the lowest temp is would be the least accurate.
ANd that doesn't matter who or what reads it either.. it is how the chips are manufactured and calibrated at the factory.